supporting science, technology, and improved economic performance and financial literacy in the 21st century. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> woodruff: israel's prime minister warned again today that iran is well on its way to creating a nuclear weapon and said the world needs to act. benjamin netanyahu spoke at the united nations. as he has often before, netanyahu condemned iran and its nuclear program, and called on other leaders to do the same. >> at stake is not merely the future of my country. at stake is the future of the world. and nothing could imperil our common future more than the arming of iran with nuclear weapons. >> woodruff: the israeli prime minister said the hour is, quote, "getting late" to stop iran as it continues its nuclear work. >> i speak about it now because the iranian nuclear calendar doesn't take time out for anyone or for anything. i speak about it now because w